Damage identification for curved bridge based on temporal-spatial information fusion technology under moving loads

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 138-145.

SUN Ke, ZHANG Yan-qing

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Abstract

According to the characteristics of wavelet packet time-frequency analysis, the concept of local energy with temporal frequency in the frequency band is introduced to propose a damage index that is used to detect the damage with the time-histories data under a moving load. In order to accuracy and anti-noise ability of damage detection, the temporal-spatial information fusion technology which uses the information of different measuring points under different moving loads is developed to make the final result of damage detection. Taking a bridge as the research object, the finite element model is established to verify the feasibility of the proposed method. Then the factor analysis and anti-noise ability of the method are conducted. The results showed that the damage index of single point is applicable to detect the multiply damages. The value of index at the damage location is associated with the location of the point that .The results of damage detection are little changed under moving load speed within a certain range. Combined with the temporal-spatial information fusion technology, the final damage identification is made; and the accuracy and anti-noise ability of damage identification can be effectively improved.

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damage identification / curved bridge / moving load / wavelet packet analysis / local energy of frequency band / temporal-spatial information fusion

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SUN Ke, ZHANG Yan-qing. Damage identification for curved bridge based on temporal-spatial information fusion technology under moving loads[J]. Journal of Vibration and Shock, 2016, 35(11): 138-145

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